优化采购单推送

AutoTurnOver.DB/purchase_advise.cs

@@ -28,7 +28,10 @@ namespace AutoTurnOver.DB
         /// <returns></returns>
         public static int? Add(dc_auto_purchase_advise data)
         {
+            if (string.IsNullOrWhiteSpace(data.buy_sys_plan_no))
+            {
                 data.buy_sys_plan_no = "";
+            }
             data.push_time = null;
             return _connection.Insert<dc_auto_purchase_advise>(data);
         }